Mattress



FIG. 1 is a top, foot end, perspective view of a mattress according to my new design;

FIG. 2 is a top plan view of the mattress of FIG. 1;

FIG. 3 is a bottom plan view of the mattress of FIG. 1;

FIG. 4 is a right side elevation view of the mattress of FIG. 1;

FIG. 5 is a left side elevation view of the mattress of FIG. 1;

FIG. 6 is a head end elevation view of the mattress of FIG. 1; and,

FIG. 7 is a foot end elevation view of the mattress of FIG. 1. 

CLAIM An ornamental design for a mattress, substantially as shown. 